Inxpect LBK System User Manual

5.2.4 Sensitivity
The system sensitivity level can be defined for the access detection function as well as the restart prevention
function. The sensitivity defines the ability of the system to prevent false alarms. Only for the access
detection function, it also defines the reaction times to motion detection: with high sensitivity the system is
more prone to false alarms, but detection is faster.
For example, it is recommended that the access detection function be set at a lower level of sensitivity if
people or objects are in transit at the perimeters of the dangerous area (e.g. forklifts or trucks).
To adjust the sensitivity of the restart prevention function, a delay interval is defined from when there is no
motion detected in the area to when machinery restart is allowed.
5.3 Dangerous area calculation
5.3.1 Introduction
The dangerous area of the machinery to which LBK System is applied must be calculated as indicated in
standards ISO 13855:2010 and ISO 13857:2008. For LBK System the fundamental factors for calculation are
height (h) and inclination (α) of the sensor, see "Sensor position" on page25.
5.3.2 Sensor height < 1 m
To calculate the depth of the dangerous area (S) for sensors with installation heights less than 1 m, use the
following formula:
Where:
Variable Description Value
Measurement
unit
K Maximum dangerous area access speed 1600 mm/s
T Total system stopping time (LBK System +
machinery)
0.1 + Machinery stopping time
(calculated in accordance with ISO
13855:2010 standard)
s
C
h
Constant that takes into account the sensor
installation height (h) according to standard
ISO 13855:2010
1200 - 0.4 * H
Note: minimum value =850 mm. If the
result of the calculation is a value less than
the minimum, use 850 mm.
mm
C
α
Constant that takes into account the sensor
installation inclination (α) according to the
indications of Inxpect SpA
If H < 500 = (20 - I) * 16
If H ≥ 500 = (-I) * 16
Note: minimum value =0mm. If the result
of the calculation is a value less than the
minimum, use 0 mm.
mm
Example 1
l Machinery stopping time =0.5 s
l Sensor installation height (H) = 100 mm
l Sensor installation inclination (I) = 10°
T = 0.1 s + 0.5 s = 0.6 s
C
h
= 1200 - 0.4 * 100 = 1160 mm
C
α
= (20 - 10) * 16 = 160 mm
S =1600 * 0.6 + 1160 + 160 = 2280 mm
5. Sensor position
LBK System| Instruction manual v1.3 SEP 2019 |LBK-System_instructions_en v1.3|© 2018-2019 Inxpect SpA
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Inxpect LBK System Specifications

General

Brand	Inxpect
Model	LBK System
Category	Safety Equipment
Language	English